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Dirt Bike Brands - Other
Exhaust End Caps
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[QUOTE="jarredtaylor, post: 226361, member: 17047"] They increase system backpressure... low end torque... Vacuum also plays a part in exhaust systems as well. Here's an example: On stock cars they route the exhaust pipe in front of the rear wheel.. it is flush with the side of the car.. why??? As air passes by at high speeds.. it actually creates vacuum which aids exhaust flow and "sucks" the exhaust out of the car... Not quite the same principle but endcaps change the flow of exhaust and vacuum carachteristics producing power in different places in the powerband. Systems with no backpressure make less torque. By the same token.. airbox breathability also plays an important on vacuum and exhaust velocity.. i.e. torque. A carb with too big a venturi causes unatomized fuel and loss of fuel velocity into the combustion chamber.. thus robbing you of torque. Too small a venturi causes a lean condition and not much power. Hope this helps. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Exhaust End Caps
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